Open Doors To Escape Level 16 Walkthrough

Open Doors To Escape Level 16 Walkthrough:Open the backpack.Take the pencil, paper, and eraser.Use the pencil on the first paper, and the eraser on the second paper.You will see the numbers on the papers (from bottom to top):1, 2, 3, 5Change the number on the box to 1235.Take the key and use it on the door.